generic bounds don't work with a generic tuple

[DetachHead]

from typing import Generic, TypeVar
from basedtyping import T

class Foo(Generic[T]): ...

U = TypeVar("U", bound=Foo[T])

class G(Generic[T]): ...

class C(G[tuple[U, T]]): ...

# error: Value of type variable "U" of "C" cannot be "int"
reveal_type(C[Foo[int], int])